Cutter head for coal-cutting machines



June 23,1925. 1,543,516

T. E. PRAY CUTTER HEAD FR GOAL CUTTING MACHINES Filed Nov. s, 1921 A TTOR/VEY inatented .lune 23, 19257. y

UNITED STATES PATENT'- omer..

THOMAS n. PRAY, or CHICAGO, rLLiNois, AssIGNoa Iro cooperen.MANUFACTURING COMPANY, or orrrcAGo, I'LLINoIsn oon-ronerron or iLLrNoIs.

CUTTER HEAD Fon'coen-onfr'rrne MAori'INns.'

Application filed November i the cutter chain type and has for its object to provide an improved construction of the cutter heads used on the machines of the class described.

The invention may best be understoodby reference to the accompanying drawings, in

' about which the chain is guided. In the.

which Figure 1 is a top plan view of a cutter head constructed in accordance with my invention.

Fig. 2 is a cross-section of the cutter head taken on line 22 of Fig. 1.

Cutter heads of the type illustrated are secured to the outer end of the cutter bar ""5 embodiment illustrated, the cutter head comprises top and bottom plates 1 and 2 spaced. apart at their lateral margins to form a groove 3 to accommodate a cutter chain (not shown). In the form shown the cutter head is provided with a pair of oppositely disposed gibs or retaining strips 4, 4, secured to the inner margins of said plates, and adapted to receive laterally eX- tending lugs on the sides of a cutter chain.

A bearing ring 5 formed of relatively hard material adaptedto resist wear is mounted between the top and bottom plates and is preferably arranged to fit about an annular shoulder 1a projecting downwardly from the top plate, and a similarly shaped `annular shoulder 2a extending upwardly from the bottom plate. The bearing ring 5 is preferably provided with a plurality of notches 6, 6, formed equi-distantly about one face thereof. -A series of stops such as pins 7, 7, project from one of the plates such as the bottomfplate 2 and register with the notches 6, 6. In the form shown, three sets of notches and p ins are shown. The arrangement is such that the position of the bearing ring may be changed-by removing one of the plates, and rotating the ring into a new position so as to present a new wearing face to the cutter chain.

Means are provided for securing the top 3,' 19271. serial no. 512,453.

and Abottom plates together which comprises av plurality/of bolts 8, 8, passing through inwardly extending bosses 9, 9formed in the top and'bottom plates immediately adjacent the annular shoulders 1a and 2L against which'the bearing engages. In the drawings,three such bolts are shown, each having a head 10, shank 11 and a nut 12.

ably counter-sunk yas shown, to provide a minimum thickness of the cutter bar. The construction just described forms a compartment on the interior' of the bearing ring suitable for containing oil for lubrication of said ring. Access to the compartment may be had through suitable taps 13, 13, formed` in the plates and provided with threaded plugs 141, 1li. Oil grooves 15, 15, may be provided in the plates 1 and 2 to conduct oil from the compartment to the bearing i ring. as desired, although in practice the ring may be fitted so loosely over the shoulders 1'DL and 2a that a suiiicient supply of oil will find its way to theouter surface of the bearing ring and thence directly to the cutter chain (not shown) movable about said ring. y

By means of the construction just described, a simple and durable form of cutter head is provided. the plates together are located close to the margins of the cutter head which form the groove in which the cutter chain is guided, so as to aord a maximum resistance to resist the vertical stresses caused by twisting bodied, it will be understood that many ff other means may be employed for accomyThe bolt heads -10 and nuts 12 are prefer- The bolts which secure fr plishing the same results, without departing from the spirit andscope of my invention. I do not therefore wish to be understood as limitingv myself to the specic construction or use illustrated herein excepting as specifically limited inthe appended claims.

I claim as my invention:

1. -A cutter head for mining machines comprising a top plate and bottom plate, a bearing ring adapted to. provide direct bearing for a cutter chain and cir'cumferentially adjustable between said plates, and a plurality of bolts ,extending through said .ital

plates Within and adjacent said bearing ring to secure said plates together.

2. A cutter head Jfor mining machines comprising a top plate and bottom plate each having annular shoulders formed on the inside faces thereof, a bearing ring adapted to provide direct bearing for a cutter chain and circumferentially adjustable about said shoulders, andV means securing said plates together.

3. A cutter head for mining machines comprising a top plate and a bottom plate, each having annular shoulders on the inside facesthereof, a bearing ring fitting about said shoulders, and forming an oil compartment between said plates, adapted to provide direct bearing for a cutter chain and means securing said plates together, means aiording access to said oil compartment through one of said plates, and

means affording communication between said compartment and the outer periphery of said bearing ring, substantially as described.

l. A cutter head for mining machines comprising a top plate and bottom plate each having annular shoulders formed on the inside facesthereof, a plurality of countersunk bosses spaced about said shoulders, a bearing ring adapted to provide direct f bearing for' a cutter chain and circumferentially adjustable about said shoulders and bosses, and a plurality of Widely spaced bolts extending through said bosses to secure said plates together.

Signed at Chicago, in the county or" Cook and State of Illinois, this thirty-firstday o October, 1921. f

THGMAS E. PRAY.` 

